Improvement in steam-engines



trufa-r ,sans

rnrtrrnsrnsor Ln'AvnNwoarH, KANSAS.

Letters Parent No. 108,576, naa oaober'zss, 1870.

IMPROVEMENT IN STEAM-ENGINES.

The Schedule referred to in these Letters Patent and making part oi the'same.

'o all whom it may concern.-

Be it known that I, PHILIP ESTES, of Leavenworth, 1n the county of Leavenworth and State of Kansas, have invented a-new and useful Improvement in Stearn- 'Engines; and I do hereby declare that the following is .a full, clear, and' exact description thereof, which will enable others skilled in the art to makeand use the same, reference' being had to the accompanying -drawing forming part of this specification.

lMy invention relates to steam-engines, and my object is to introducecertain improvements thereon,

which will first be described iif connection with all that is necessary to a full understanding thereof', and then be clearly pointed out in the claim.

In the accompanying drawing- Figure 1 represents a side view of the engine, showing the exhaust-valve chamber and the cam by' which the exhaust-valve is operated;

Figure 2 is a top or plan view of the engine, but showing the cylinder and the receiving and exhaustchambers in section, and giving a'view of the ports to and from the cylinder for receiving and exhausting the steam;

Figure 3 is a detail of the cam for working the steam or receiving-valve, showing the mode of adj nsting it for forming a variable cut-off;

Figure-4 is a section of ig.'3 on thc-line a: x;

Figure 5 is a cross-section; and Y Figure 6 is a longitudinal section of the cylindrical seats in which the valves work, the sections being on the lines y y and z z ofthose figures.

Similar letters of reference indicate corresponding parts.

,A is the cylinder of the engine.

l is the piston.

-0 is the 'receiving-chamber.

l) is the exhaust-chamber.

Ihese chambers are cylindrical in form and attached to opposite sides ofthe cylinder A, and correspond in length therewith, as seen in the drawing.

.c represents the induction and d the ednction ports Aof the cylinder,- which, it will be seen, are entirely separate and distinct from eachother.

llhe steam is admitted to and exhausted from cach end of the cylinder .for each stroke of theengine.

This arrangement, of course, requires a double valve for each chamber.

F represents the double valve for the induction or receiving-chamber, and

vGr, the double valve for the eduction or exhaustchamber.,

Each valve consists' of two heads connected by the rods H.

werking in the yoke X.

I do not confine myself to the use of cams exclu- The form of the seat in which the valve-heads work is seen in the iigs. 5 and 6.

i is a steam space around the-rods H.

j are the valve-seats, which are open on their sides,

vso that the steam presses equally upon the sides of the valve-heads, thus preventing the friction usually produced by slide valves.

Ihe valves move on a line parallel with the piston ofthe engine. i i

K is. the stem of the induction-valve.

L is the stem-of the exhaust-valve.

The former is connected with the adjustable cam M, (see figs. 3 and 4,) which cam revolves in the yokeN, to which the valve-rod K is attached.

The cam M is fastened to the end of a small shaft, lwhich is supported by the bracket O.

This shaft is revolved from the main shaft P by means of the gear-wheels'q q.

- The .bracket O is attached .to the .frame R of the engine.

The cam M 'is formed in two parts, S and T;

By means of the, screw Uvthe position of S may be varied on the part T so as to cut ofl the .steam at any desired point of the stroke.

rlhe exhaust-valve is moved by the crank V on the' end of the wrist of the pitman by meansof a cam, w,

(See-tig. 1.)

sively for moving either of the valves the proper distance; ecccntn'cs may be used in this connection; if

desired.

The advantages of this mode of constructing sream- I engines are many, and must be obvious to all who are acquainted with them.

Having thus described my invention,

I claim as new and desire tosecnre by Lettersy Patent.-

A variable cam, formed of-two parts S T, arranged and operating to move the cut-oi'point forward or back, in the manner described.

PHILIP ESTES.

Witnesses:

SAML'E ATWooD,

EDRUssELL. 

